| 摘要 |
A method and apparatus for detecting variation in the spacing of an array of conducting strands embedded within a rubber or plastics medium. A transmitter of microwave radiation is placed on one side of the array and a detector on the opposite side, the frequency of the radiation being chosen so that the transmission of the signal through the array is affected by the spacing of the conducting strands. The array is moved past the transmitter and the detector, any variation in strand spacing being shown by a variation in the signal received by the detector, of which the following is a specification.
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